feat(M04-B): 完成订单状态机与迁移历史

database/migrations/2026062012_m04b_order_state_machine.down.sql

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+DELETE FROM qipai_schema_migrations WHERE version = '2026062012';
+DROP TABLE IF EXISTS qipai_order_status_history;
+ALTER TABLE qipai_orders
+  DROP COLUMN status_updated_at,
+  DROP COLUMN status_version;

database/migrations/2026062012_m04b_order_state_machine.up.sql

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+ALTER TABLE qipai_orders
+  ADD COLUMN status_version INT UNSIGNED NOT NULL DEFAULT 1 AFTER status,
+  ADD COLUMN status_updated_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3)
+    AFTER status_version;
+
+CREATE TABLE IF NOT EXISTS qipai_order_status_history (
+  id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
+  tenant_id BIGINT UNSIGNED NOT NULL,
+  order_id BIGINT UNSIGNED NOT NULL,
+  from_status VARCHAR(32) NULL,
+  to_status VARCHAR(32) NOT NULL,
+  action VARCHAR(32) NOT NULL,
+  actor_type VARCHAR(32) NOT NULL,
+  actor_id BIGINT UNSIGNED NULL,
+  source VARCHAR(32) NOT NULL,
+  reason VARCHAR(512) NOT NULL DEFAULT '',
+  trace_id VARCHAR(128) NOT NULL,
+  metadata JSON NOT NULL,
+  created_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
+  CONSTRAINT fk_qipai_order_history_tenant
+    FOREIGN KEY (tenant_id) REFERENCES qipai_tenants(id),
+  CONSTRAINT fk_qipai_order_history_order
+    FOREIGN KEY (order_id) REFERENCES qipai_orders(id),
+  UNIQUE KEY uq_qipai_order_history_trace (tenant_id, order_id, trace_id),
+  KEY idx_qipai_order_history_order (tenant_id, order_id, id),
+  KEY idx_qipai_order_history_status (tenant_id, to_status, created_at)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+
+INSERT IGNORE INTO qipai_order_status_history
+  (tenant_id, order_id, from_status, to_status, action, actor_type,
+   actor_id, source, reason, trace_id, metadata, created_at)
+SELECT tenant_id, id, NULL, status, 'MIGRATED', 'SYSTEM',
+       NULL, 'MIGRATION', 'M04-B baseline history',
+       CONCAT('m04b-migration-', id), JSON_OBJECT('statusVersion', 1), created_at
+FROM qipai_orders;
+
+INSERT IGNORE INTO qipai_schema_migrations (version, name)
+VALUES ('2026062012', 'm04b_order_state_machine');

database/migrations/2026062012_m04b_order_state_machine.verify.sql

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+SELECT column_name FROM information_schema.columns
+WHERE table_schema = DATABASE() AND table_name = 'qipai_orders'
+  AND column_name IN ('status_version', 'status_updated_at')
+ORDER BY column_name;
+
+SELECT table_name FROM information_schema.tables
+WHERE table_schema = DATABASE()
+  AND table_name = 'qipai_order_status_history';
+
+SELECT index_name FROM information_schema.statistics
+WHERE table_schema = DATABASE()
+  AND table_name = 'qipai_order_status_history'
+  AND index_name IN (
+    'uq_qipai_order_history_trace',
+    'idx_qipai_order_history_order',
+    'idx_qipai_order_history_status'
+  )
+GROUP BY index_name ORDER BY index_name;
+
+SELECT version, name FROM qipai_schema_migrations WHERE version = '2026062012';